<?php
// $Id: talk.module,v 1.1.2.1.2.1.2.1 2008-09-17 16:07:26 heine Exp $

/**
 * @file
 * Comments are displayed in a separate 'talk' tab, for node types you wish
 * Made for Drupal 5.x
 */

/**
 * Implementation of hook_help().
 */
function talk_help($section) {
  switch ($section) {
    case 'admin/help#talk':
      $output = '<p>'. t('The talk module gives you the option to display comments on a seperate tab. The option is per content type and can be set in the workflow options of a content type.') .'</p>';
      return $output;
  }
}

/**
 * Implementation of hook_menu().
 */
function talk_menu($may_cache) {
  $items = array();
  if ($may_cache) {
    $items[] = array(
      'path' => 'admin/settings/talk',
      'title' => 'Talk page',
      'description' => 'Configure settings for the talk page.',
      'callback' => 'drupal_get_form',
      'callback arguments' => array('talk_admin_form'),
    );
  }
  else {
    if (arg(0) == 'node' && is_numeric(arg(1))) {
      $node = node_load(arg(1));
      if (talk_activated($node->type) && $node->nid && _talk_node_comment_value($node)) {
        $items[] = array(
          'path' => 'node/'. arg(1) .'/talk',
          'title' => talk_title(),
          'callback' => 'talk_handle',
          'callback arguments' => array(arg(1)),
          'access' => (user_access('access comments') && node_access('view', $node)),
          'type' => MENU_LOCAL_TASK,
          'weight' => 1,
        );
      }
    }
  }
  return $items;
}

/**
 * Helper item for talk_menu: access callback.
 */
function _talk_access($perm, $node) {
  return (user_access($perm) && talk_activated($node->type) && $node->nid && _talk_node_comment_value($node));
}

/**
 * Menu call back for admin form.
 */
function talk_admin_form() {
  $form = array();
  $form['talk_title'] = array(
    '#type' => 'textfield',
    '#title' => t('Title of the "talk" page'),
    '#default_value' => talk_title(),
  );
  return system_settings_form($form);
}

function talk_title($title = NULL) {
  if (is_null($title)) {
    return variable_get('talk_title', t('Talk'));
  }
  variable_set('talk_title', $title);
}

/**
 * Menu callback for talk page.
 */
function talk_handle($nid) {
  $node = node_load($nid);
  drupal_set_title(check_plain($node->title));
  $add_comments = _talk_node_comment_value($node) == COMMENT_NODE_READ_WRITE && user_access('post comments');
  return theme('talkpage', $node, $add_comments);
}

/**
 * Implementation of hook_nodeapi().
 */
function talk_nodeapi(&$node, $op) {
  switch ($op) {
    case 'load':
      if (talk_activated($node->type) && arg(0) == 'node' && !arg(2)) {
        // Overwrite setting of comment module and set comments for this node to disabled.
        // This prevents the comments of being displayed.
        $output['comment_original_value'] = $node->comment;
        $output['comment'] = 0;
        return $output;
      }
      break;
  }
}

/**
 * Implementation of hook_link().
 */
function talk_link($type, $node = NULL, $teaser = FALSE) {
  if ($type == 'node' && talk_activated($node->type) && user_access('access comments')) {
    $result = array();
    if ($node->comment_count) {
      $result['talk_view'] = array(
        'title' => t('@title page (@nr comments)', array('@nr' => $node->comment_count, '@title' => talk_title())),
        'href' => 'node/'. $node->nid .'/talk',
      );
    }
    if (_talk_node_comment_value($node) == COMMENT_NODE_READ_WRITE) {
      $result['comment_add'] = array(
        'title' => t('Add new comment'),
        'href' => "comment/reply/$node->nid",
      );
    }
    return $result;
  }
}

/**
 * Implementation of hook_form_alter().
 */
function talk_form_alter($form_id, &$form) {
  // Add option to comment options of node types.
  if ($form_id == 'node_type_form' && isset($form['identity']['type']) && module_exists('comment')) {
    $form['workflow']['comment_talk'] = array(
      '#type' => 'checkbox',
      '#title' => t('Display comments on separate talk page'),
      '#prefix' => '<strong>'. t('Talk pages:') .'</strong>',
      '#weight' => 5,
      '#default_value' => talk_activated($form['#node_type']->type),
    );
  }
}

/**
 * Implementation of hook_comment()
 * Changing the destination to the talk page after posting a comment
 */
function talk_comment($a1, $op) {
  if ($op == 'insert' || $op == 'update') {
    $nid = $a1['nid'];
    $node = node_load($nid);
    if (talk_activated($node->type)) {
      $_REQUEST['destination'] = 'node/'. $a1['nid'] .'/talk';
    }
  }
} 
/**
 * Is talk page option activated for node tpye?
 */
function talk_activated($node_type, $value = NULL) {
  if (is_null($value)) {
    return variable_get('comment_talk_'. $node_type, FALSE);
  }
  variable_set('comment_talk_'. $node_type, $value);
}

/**
 * Value of 'comment' of node.
 */
function _talk_node_comment_value(&$node) {
  return isset($node->comment_original_value) ? $node->comment_original_value : $node->comment;
}

/*
 * Theme functions
 */

/**
 * Theme talkpage for node
 * @param $node
 *   node whose talk page is displayed
 * @param $add_comments
 *   boolean which indicates if the adding of comments is allowed for current user
 */
function theme_talkpage($node, $add_comments) {
  $output = '';
  $output .= comment_render($node);
  if ($node->comment_count && $add_comments) {
    $output .= '<p>' . l(t('Add new comment'), "comment/reply/$node->nid") . '</p>';
  }
  return $output;
}